Pacify clang-tidy for ncclCommInitAll()

[Jacobfaib]

Description

closes

Checklist

• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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• cudax/test/multi_gpu/communicators/nccl/nccl_test_helpers.cuh

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📝 Walkthrough

Summary by CodeRabbit

• Chores
  • Updated an internal multi-GPU test helper to use an explicit device-count conversion, improving type safety with no change in behavior.

Walkthrough

This PR modifies a single line in the nccl_comm_fixture constructor, changing the device count argument passed to ncclCommInitAll from an implicit size_t-to-int conversion to an explicit static_cast. No behavioral or control flow changes occur elsewhere.

Changes

NCCL Test Fixture Fix

Layer / File(s)	Summary
Explicit cast for device count cudax/test/multi_gpu/communicators/nccl/nccl_test_helpers.cuh	ncclCommInitAll call updated to use static_cast<int>(devs.size()) instead of implicit conversion.

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